lightstyles export option

README.md

@@ -18,6 +18,7 @@ A tool to convert bsp maps (Half-Life and other GoldSrc games) into gltf scenes.
 
 * `-lm <number>` - set a lightmap atlas size
 * `-skip_sky` - exclude polygons with 'sky' texture from export 
+* `-lstyle <number>|all` - export lightmap with a specified lightstyle index or all lightyles in one
 
 ## Dependencies (already included)
 

src/bsp-converter.cpp

@@ -8,7 +8,7 @@ int main(int argc, const char *argv[])
 	printf("bsp-converter by lewa_j v0.6 - 2022\n");
 	if (argc < 2 || !strcmp(argv[1], "-h"))
 	{
-		printf("Usage: bsp-converter map.bsp [-lm <lightmap atlas size>] [-skip_sky]\n");
+		printf("Usage: bsp-converter map.bsp [-lm <lightmap atlas size>] [-skip_sky] [-lstyles <light style index>|all]\n");
 		return -1;
 	}
 
@@ -41,6 +41,21 @@ int main(int argc, const char *argv[])
 				printf("Warning: '-lm' parameter requires a number - lightmap atlas resolution\n");
 			}
 		}
+		if (!strcmp(argv[i], "-lstyle"))
+		{
+			if (argc > i + 1)
+			{
+				i++;
+				if (!strcmp(argv[i], "all"))
+					config.lstylesAll = true;
+				else
+					config.lstyle = atoi(argv[i]);
+			}
+			else
+			{
+				printf("Warning: '-lstyle' parameter requires a number - light style index, or a word 'all'\n");
+			}
+		}
 		else if (!strcmp(argv[i], "-skip_sky"))
 		{
 			config.skipSky = true;

src/hlbsp.cpp

@@ -192,7 +192,7 @@ bool Map::load(const char *path, const char *name, LoadConfig *config)
 		const dface_t &f = faces[i];
 		for (int j = 0; j < LM_STYLES; j++)
 		{
-			if (f.styles[j] != 0 && f.styles[j] != 255)
+			if (f.styles[j] != 0 && f.styles[j] != 255 && (config->lstylesAll || f.styles[j] == config->lstyle))
 			{
 				activeStyles++;
 				break;
@@ -218,6 +218,8 @@ bool Map::load(const char *path, const char *name, LoadConfig *config)
 			for (int s = 1; s < LM_STYLES && f.styles[s] != 255; s++)
 			{
 				lmOffset += fl.size[0] * fl.size[1] * 3;
+				if (!config->lstylesAll && f.styles[s] != config->lstyle)
+					continue;
 				for (int l = 0; l < flmap.size(); l++)
 				{
 					int val = flmap[l] + lightmapPixels[f.lightofs + lmOffset + l];
@@ -234,7 +236,10 @@ bool Map::load(const char *path, const char *name, LoadConfig *config)
 				data += fl.size[0] * 3;
 			}
 		}
-		lmap2.save((std::string(name) + "_styles_lightmap.png").c_str());
+		if (config->lstylesAll)
+			lmap2.save((std::string(name) + "_styles_lightmap.png").c_str());
+		else
+			lmap2.save((std::string(name) + "_style" + std::to_string(config->lstyle) + "_lightmap.png").c_str());
 	}
 
 	return true;

src/hlbsp.h

@@ -120,6 +120,8 @@ struct LoadConfig
 {
 	bool skipSky = false;
 	int lightmapSize = 1024;
+	int lstyle = -1;
+	bool lstylesAll = false;
 };
 
 class Map